Your question would be more useful if you were more specific. I have just made a To-Do list and I just used black pen, red pen end plain A4 paper. This what I u

Your question would be more useful if you were more specific. I have just made a To-Do list and I just used black pen, red pen end plain A4 paper. This what I use when I want to be meticulous for something that I have to plan only one time. I guess Org-mode would be fine if you do not like good old paper